package stu.day02;

public class StringPlusDemo {
        public static void main(String[] args) {
            //tt1();
            tt2();
        }

        public static void tt1(){
            long before = System.currentTimeMillis();

            String str = "";

            for (int i=0;i<100000;i++){
                str+=i;//str = str + i;
            }

            System.out.println((System.currentTimeMillis()-before)+"ms");

        }

        public static void tt2(){
            long before = System.currentTimeMillis();

            StringBuilder builder = new StringBuilder();

            for (int i=0;i<100000;i++){
                // str+=i;//str = str + i;
                builder.append(i);
            }

            System.out.println((System.currentTimeMillis()-before)+"ms");

        }
}
